999998843 has 2 divisors, whose sum is σ = 999998844. Its totient is φ = 999998842.

The previous prime is 999998801. The next prime is 999998863. The reversal of 999998843 is 348899999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999998843 - 2¹² = 999994747 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999998863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999421 + 499999422.

It is an arithmetic number, because the mean of its divisors is an integer number (499999422).

Almost surely, 2^999998843 is an apocalyptic number.

999998843 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998843 is an equidigital number, since it uses as much as digits as its factorization.

999998843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45349632, while the sum is 68.

The square root of 999998843 is about 31622.7583079022. The cubic root of 999998843 is about 999.9996143332. Note that the first 3 decimals are identical.

The spelling of 999998843 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred forty-three".